Bituminous saturant



Patented Jan. 8 1935 -1.9sv.0' BITUMINOUS SATURANT Robert It. Thurston, Beacon, N. Y., assignor to The'TexasCompany, New York, N. Y.,,,a corporationof Delaware No Drawing. Application February 9, 1933, Serial 12 Claims. (01. 190-152) This invention relates to a bituminous saturating material for fabrics, such as cotton-covered insulated wires, and the like. i

It is a primary object ofthe invention to provide a material for this purpose which will have high penetrating qualities at a sufficiently low viscosity to permit saturation of the fabric with-- out the necessity of employing extremely high saturating temperatures.

It is a further object to provide avsaturant formed of the usual bituminous materials available at petroleum oil refineries and which will remain in a stable homogeneous condition until it is applied and which thereafter will adequate- ,ly protect the fabric against weathering for a long period of time.

The preferred saturant for this purpose is com,- posed of a major proportion of cracked residuum and a' lesser proportion of-asphaltic residuum, the mixture being cut back with raw asphaltic residuum, herein referred to as fuel residuum, this material being a solvent for the'base mixture and itself having good weatherproofingqualities.-- The proportions for the base materials may comprise from 40% to 90% of cracked residuum and from; to 10% of asphaltic mixing stock. The base may be cut back with -from2% to 25 or more of the fuel residuum. The cracked residuum which is employed is the usual pressuretar ponstituting the residuum from commercial pyrolytic cracking operations. ferred to herein may be the residue from petroleum oil distillation equipment which operates at less than cracking pressures and temperatures. The residuum from vacuum stills operating on naphthene base crude is preferred.

It is preferred to preliminarily reduce the cracked residuum to a viscosity of from '70 to (Furol) at 210 F. by steam reduction and to air-blow the asphaltic material constituting the mixing stock for several hours at a temperature of between 400 and 500 F. The base, formed of the mixture of cracked residuum and asphaltic residuum, is then air blown at from 400 to 500 F. to a melting point of from to 150 F. before the addition of the fuel residuum.

The following is given by way of example of a preferred form of the material and the process of preparing the same. A quantity of cracked residuum was steam reduced at from 500 to 550 F. to a viscosity of '70 to 90 (Furol) at 210 F. 85% of this steam reduced material was mixed with 15% by Weight of an air-blown a'sphaltic residuum constituting the mixing stock. The base of the mixing stock was a residuum from a naph- The asphaltic residuum reistics necessary where the exposed.

thene base crude produced in a vacuum tube still and testing 45(tenth millimeters) penetration at 77 F; The mixing stock'was in some cases airblown alone to reduce the penetration and'in-' crease the melting point, but this is not essential. The mixture was thereafter air-blown at a temperature of approximately 460 F..to'a meltingpoint (ball and ring). of from 131 to' 133 F- This blended product was then transferred to storage and cut back with from 5% to 8% by'vol-" ume of a raw or untreatedrelatively light or fluid asphalticl residuum. Care was taken thereafter to maintain the temperature of the finished pro'dtuct at not over 300 F., as, for example, while be"--' ing drawnoff into. containers for transportation.

, Samples'of the finished product produced as above have substantially the following charactere" istics,,'melting point v(ball and ring) .to 135 F.',, penetration at 77 F. 20 to 30 (tenth millimeters) viscosity (Stormer) at 280 F. 85 to'105' The addition of the-raw fuel residuum to the aim-blown. product, during the final stages of the wise have. -It also gives the product greaterpliw bility; and materially increases the penetrating: qualitiesrof the saturant at the elevated temperatures, 300 F., e. g., at whichit is applie'dto such' materialsas the woven Icotton covering of in-n= sulated wire. The cracked residuum gives the product; asubstantially heavier gravity 'and a lower viscosity "at elevated temperatures, the viscos-J ity being a critical factor of materials for the purposes of the present-saturant. It is unnecessary to add to the saturating material, produced in accordance with the present invention, any other diluents or solvents nor to add the usual undesirable materials for decreasing the viscosity,

such for example, as wax tailings. A sufficient Y quantity of asphaltic residuum is present to render the mixture homogeneous and to give the final product the body and weathering charactercoated product is to be The methods of determining the penetration, melting point, viscosity, etc., referred to herein are the standard tests approved by the A. S. T. M.

While there are shown and described specific and preferred examples of the saturating material produced in accordance with the present invention, it will be understood that these are by way of example only and that the invention is to be limited only as set forth in the appended claims.

I claim: I 1. A saturant for weather-proofing fabric comprising a base embodying to 90% of steam reduced cracked residuum, 50% to 10% of airblown asphaltic mixing stock, out back with from 2% to 10% of relatively light asphaltic residuum.

2. A saturant for weatherproofing fabric com.- prisinga base embodying approximately of steam reduced cracked residuumand 15% of airblown asphaltic mixing stock out back with a small quantity of relatively light untreated asphaltic residuum. 3. A saturant for weatherproofing fabric comprising a base embodying ,over 50% of steam reduced cracked residuum and less than 50% of air-blown naphthene base fuel residuum, cut back with from 2% to 10% of relatively light untreated asphaltic residuum. I

4. A saturant for weatherproofing fabric comprising an air-blown mixture embodying 50% to of .steam reduced cracked residuum, 50% to 1 0% of air-blown asphaltic mixing stock, cut back with from 2% to 10% of relatively light asphaltic residuum. v

5..A saturant for weatherproofing fabric comprisingan air-blown mixture'of steam'reduced cracked residuum and asphaltic residuum to which there" has been added from 2%"to' 10%,of. an untreated relatively light asphaltic residuum, and having substantially the'followingi characteristics, melting point (ball 1 and ring)-=-l30 to F., penetration at 77'F.25 to 30.and' a (Stormer) viscosity at 280 E.85 to 105R. P. M.

.. '6. The. process of forming a satur'ant for weatherproofing fabric comprising steam reducing a residuumand thereafter adding from 2% to 10% of raw asphaltic'residuum.

'7. The process of forming a saturant for wean;

erproofingfabric comprising steam reducingja 1.; quantity of cracked residuum; air-bldw'ingaquam tityiof asphaltic residuum, mixing a major proportion. of said reduced cracked residuum with a minor proportion of said air-blown a'sphaltic're-.

siduum, air-blowingsaid mixture and thereafter adding a .quantity'of raw'asphalticresiduum.

8. The process of forming a saturant'for weatherproofing fabric comprising, reducing cracked'residuum to increase the viscosity-thereof, air-blow- I ing asphaltic residuum from the vacuum distillation of a naphthene base crude oil, mixing said reduced cracked residuum with said air-blown asphaltic residuum and diluting said mixed materials with a small proportion of raw asphaltic residuum. I

9. The process of forming a saturant for weatherprooflng fabric comprising reducing cracked residuum to a Furol viscosity of 70 to 90 at 210 F.,

air-blowing an asphaltic residue to a penetration at 77 F. of 40 to 60, mixing and blending said re-' 'duced cracked residuum and air-blown asphaltic ing approximately 85% of said" reduced cracked residuum with 15% of said air-blown asphaltic residuum and adding .tothe mixed materials from 2% to 10% of raw 'as'phaltic residuum for reduc-- ing the'viscosity and in'creasingthe penetrating qualities of the mixture.

'11. The process of forming a saturant for weatherproofing fabric comprising reducing cracked residuum to a Furol viscosity of '70 to 90 at 210 F., air-blowing an asphaltic residue to a penetration at 77 F; of 40 blending approximatley 85% to 60, mixing andof v said reduced cracked residuum with 15% of said aireblo'w'n asphaltic residuum, blowing said mixture to a melting point of from 1 20 to F. and adding to. the mixed materialsfrom 2% asphaltic residuum for reducing'the viscosity and increasing the penetrating qualities of the mixa 1 4 ;12'. The process of forming a saturant for" ture.

to 10% of raw weatherproofing fabric comprising steam 're-f.

ducing cracked'residu'um, air-blowing an asphaltic residuum, mixing and blending said residua' by adding amaior proportion'fof said reduced cracked residuum to a minor proportionof said as'phaltic residuum and air-blowing the mixture at anelevated temperature and thereafter cutting'back said air-blown mixture with a relatively small proportion of a petroleum, product 'havin gflhig'h solvent qualities for said residua. 5

ROBERT E. THURSTON. a 

